First of all, thanks for all the great replies! You are very helpful!
Hmm.. I repaired disk permissions now, a lot of things were wrong, it seems. Here's a summary. Will look more into the problem tomorrow if it doesn't disappear.
2005-01-12 06:07:03 +0100 - Reparasjon av rettigheter har startet
Permissions differ on ./System/Library/Filesystems/cd9660.fs/cd9660.util, should be -rwsr-xr-x , they are -rwxr-xr-x
Owner and group corrected on ./System/Library/Filesystems/cd9660.fs/cd9660.util
Permissions corrected on ./System/Library/Filesystems/cd9660.fs/cd9660.util
We are using special permissions for the file or directory ./System/Library/Filesystems/hfs.fs/hfs.util. New permissions are 33261
Permissions differ on ./private/etc/hostconfig, should be -r--r--r-- , they are -rw-r--r--
Owner and group corrected on ./private/etc/hostconfig
Permissions corrected on ./private/etc/hostconfig
Group differs on ./private/var/db/SystemConfiguration/preferences.xml, should be 0, group is 80
Owner and group corrected on ./private/var/db/SystemConfiguration/preferences.xml
Permissions corrected on ./private/var/db/SystemConfiguration/preferences.xml
User differs on ./private/var/db/locate.database, should be 0, owner is -2
Permissions differ on ./private/var/db/locate.database, should be -rw-r--r-- , they are -r--r--r--
Owner and group corrected on ./private/var/db/locate.database
Permissions corrected on ./private/var/db/locate.database
Permissions differ on ./private/var/db/netinfo/local.nidb/Clean, should be -rw-r--r-- , they are -rw-------
Owner and group corrected on ./private/var/db/netinfo/local.nidb/Clean
Permissions corrected on ./private/var/db/netinfo/local.nidb/Clean
Group differs on ./private/var/run/utmp, should be 0, group is 1
Owner and group corrected on ./private/var/run/utmp
Permissions corrected on ./private/var/run/utmp
Permissions differ on ./Library/Documentation/Services/apache/install.html.es, should be -rwxrwxr-x , they are -rw-rw-r--
Owner and group corrected on ./Library/Documentation/Services/apache/install.html.es
Permissions corrected on ./Library/Documentation/Services/apache/install.html.es
Permissions differ on ./Library/Internet Plug-Ins/QuickTime Plugin.plugin/Contents/MacOS/QuickTime Plugin, should be -rwxrwxr-x , they are -rwxr-xr-x
Owner and group corrected on ./Library/Internet Plug-Ins/QuickTime Plugin.plugin/Contents/MacOS/QuickTime Plugin
Permissions corrected on ./Library/Internet Plug-Ins/QuickTime Plugin.plugin/Contents/MacOS/QuickTime Plugin
User differs on ./Library/Internet Plug-Ins/Shockwave Flash NP-PPC, should be 0, owner is 501
Permissions differ on ./Library/Internet Plug-Ins/Shockwave Flash NP-PPC, should be -rw-rw-r-- , they are -rw-r--r--
Owner and group corrected on ./Library/Internet Plug-Ins/Shockwave Flash NP-PPC
Permissions corrected on ./Library/Internet Plug-Ins/Shockwave Flash NP-PPC
User differs on ./Library/Perl/darwin/auto, should be 0, owner is 503
Group differs on ./Library/Perl/darwin/auto, should be 80, group is 20
Permissions differ on ./Library/Perl/darwin/auto, should be drwxrwxr-x , they are drwxr-xr-x
Owner and group corrected on ./Library/Perl/darwin/auto
Permissions corrected on ./Library/Perl/darwin/auto
User differs on ./Library/Perl/darwin, should be 0, owner is 503
Group differs on ./Library/Perl/darwin, should be 80, group is 20
Permissions differ on ./Library/Perl/darwin, should be drwxrwxr-x , they are drwxr-xr-x
Owner and group corrected on ./Library/Perl/darwin
Permissions corrected on ./Library/Perl/darwin
User differs on ./Library/Perl, should be 0, owner is 503
Group differs on ./Library/Perl, should be 80, group is 20
Permissions differ on ./Library/Perl, should be drwxrwxr-x , they are drwxr-xr-x
Owner and group corrected on ./Library/Perl
Permissions corrected on ./Library/Perl
Permissions differ on ./System/Library/Sounds/Glass.aiff, should be -rw-r--r-- , they are -rw-rw-rw-
Owner and group corrected on ./System/Library/Sounds/Glass.aiff
Permissions corrected on ./System/Library/Sounds/Glass.aiff
Permissions differ on ./System/Library/Sounds/Purr.aiff, should be -rw-r--r-- , they are -rw-rw-rw-
Owner and group corrected on ./System/Library/Sounds/Purr.aiff
Permissions corrected on ./System/Library/Sounds/Purr.aiff
Permissions differ on ./System/Library/Sounds/Submarine.aiff, should be -rw-r--r-- , they are -rw-rw-rw-
Owner and group corrected on ./System/Library/Sounds/Submarine.aiff
Permissions corrected on ./System/Library/Sounds/Submarine.aiff
Permissions differ on ./usr/bin/more, should be -r-xr-xr-x , they are -rwxr-xr-x
Owner and group corrected on ./usr/bin/more
Permissions corrected on ./usr/bin/more
Permissions differ on ./usr/libexec/MiniTerm.app/Contents/version.plist, should be -r--r--r-- , they are -rw-r--r--
Owner and group corrected on ./usr/libexec/MiniTerm.app/Contents/version.plist
Permissions corrected on ./usr/libexec/MiniTerm.app/Contents/version.plist
Permissions differ on ./private/etc/slpsa.conf, should be -rwxr-xr-x , they are -rw-r--r--
Owner and group corrected on ./private/etc/slpsa.conf
Permissions corrected on ./private/etc/slpsa.conf
Permissions differ on ./usr/share/man/man1/more.1, should be -r--r--r-- , they are -rw-r--r--
Owner and group corrected on ./usr/share/man/man1/more.1
Permissions corrected on ./usr/share/man/man1/more.1
Permissions differ on ./usr/share/man/man3/db.3, should be -r--r--r-- , they are -rw-r--r--
Owner and group corrected on ./usr/share/man/man3/db.3
Permissions corrected on ./usr/share/man/man3/db.3
Permissions differ on ./usr/share/man/man3/DB.3, should be -rw-r--r-- , they are -r--r--r--
Owner and group corrected on ./usr/share/man/man3/DB.3
Permissions corrected on ./usr/share/man/man3/DB.3
Permissions differ on ./usr/share/man/man3/db.3, should be -r--r--r-- , they are -rw-r--r--
Owner and group corrected on ./usr/share/man/man3/db.3
Permissions corrected on ./usr/share/man/man3/db.3
Permissions differ on ./Applications/iMovie.app/Contents/PkgInfo, should be -rwxrwxr-x , they are -rw-rw-r--
Owner and group corrected on ./Applications/iMovie.app/Contents/PkgInfo
Permissions corrected on ./Applications/iMovie.app/Contents/PkgInfo
Permissions differ on ./Applications/iPhoto.app/Contents/PlugIns/ContactSheetPrintFormatter.iPhotoPrintFormatter/Contents/MacOS/ContactSheetPrintFormatter, should be -rw-rw-r-- , they are -rwxrwxr-x
Owner and group corrected on ./Applications/iPhoto.app/Contents/PlugIns/ContactSheetPrintFormatter.iPhotoPrintFormatter/Contents/MacOS/ContactSheetPrintFormatter
Permissions corrected on ./Applications/iPhoto.app/Contents/PlugIns/ContactSheetPrintFormatter.iPhotoPrintFormatter/Contents/MacOS/ContactSheetPrintFormatter
Permissions differ on ./Applications/iPhoto.app/Contents/PlugIns/FileExporter.iPhotoExporter/Contents/MacOS/FileExporter, should be -rw-rw-r-- , they are -rwxrwxr-x
Owner and group corrected on ./Applications/iPhoto.app/Contents/PlugIns/FileExporter.iPhotoExporter/Contents/MacOS/FileExporter
Permissions corrected on ./Applications/iPhoto.app/Contents/PlugIns/FileExporter.iPhotoExporter/Contents/MacOS/FileExporter
Permissions differ on ./Applications/iPhoto.app/Contents/PlugIns/FullPagePrintFormatter.iPhotoPrintFormatter/Contents/MacOS/FullPagePrintFormatter, should be -rw-rw-r-- , they are -rwxrwxr-x